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136 .TH rc4 3 "2015-07-09" "1.0.1p" "OpenSSL"
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142 RC4_set_key, RC4 \- RC4 encryption
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/rc4.h>
148 \& void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
150 \& void RC4(RC4_KEY *key, unsigned long len, const unsigned char *indata,
151 \& unsigned char *outdata);
154 .IX Header "DESCRIPTION"
155 This library implements the Alleged \s-1RC4\s0 cipher, which is described for
156 example in \fIApplied Cryptography\fR. It is believed to be compatible
157 with RC4[\s-1TM\s0], a proprietary cipher of \s-1RSA\s0 Security Inc.
159 \&\s-1RC4\s0 is a stream cipher with variable key length. Typically, 128 bit
160 (16 byte) keys are used for strong encryption, but shorter insecure
161 key sizes have been widely used due to export restrictions.
163 \&\s-1RC4\s0 consists of a key setup phase and the actual encryption or
166 \&\fIRC4_set_key()\fR sets up the \fB\s-1RC4_KEY\s0\fR \fBkey\fR using the \fBlen\fR bytes long
169 \&\s-1\fIRC4\s0()\fR encrypts or decrypts the \fBlen\fR bytes of data at \fBindata\fR using
170 \&\fBkey\fR and places the result at \fBoutdata\fR. Repeated \s-1\fIRC4\s0()\fR calls with
171 the same \fBkey\fR yield a continuous key stream.
173 Since \s-1RC4\s0 is a stream cipher (the input is XORed with a pseudo-random
174 key stream to produce the output), decryption uses the same function
177 Applications should use the higher level functions
178 \&\fIEVP_EncryptInit\fR\|(3)
179 etc. instead of calling the \s-1RC4\s0 functions directly.
181 .IX Header "RETURN VALUES"
182 \&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR do not return values.
185 Certain conditions have to be observed to securely use stream ciphers.
186 It is not permissible to perform multiple encryptions using the same
189 .IX Header "SEE ALSO"
190 \&\fIblowfish\fR\|(3), \fIdes\fR\|(3), \fIrc2\fR\|(3)
193 \&\fIRC4_set_key()\fR and \s-1\fIRC4\s0()\fR are available in all versions of SSLeay and OpenSSL.